The buck's and hen's nights that got so out of hand, the wedding was cancelled.

Here’s a hot tip: don’t cheat on your partner a couple of days before your wedding. It doesn’t bode well for the longevity of your relationship.

It might seem like straightforward advice, yet one of the leading causes of couple’s cancelling their impending nuptials mere moments before their big day appears to be bucks or hens night indiscretions.

Reddit users are sharing the bachelor and bachelorette party moments where it was obvious there wasn’t going to be a wedding afterwards.

Obviously, there are the cheaters:

“Bachelor hooks up with a girl, gives her his cell phone number so they can continue the party that night,” one recalls of a particularly raucous night out in Vegas.

“Bride to be is sitting at home with the iPad getting all of the iMessages from the girl. She cancelled the wedding that day.”

Ouch.

This can only end badly.

Another groom-to-be allegedly paid a stripper for a hand job, which led to his future brother-in-law punching him in the jaw. Quite rightly.

As one reader observed: "Who would be dumb enough to cheat on their soon to be wife in front of her brother?"

Good question.

Then there are the liars:

It's not just the boys who misbehave. One unfortunate groom discovered his future wife had been lying to him FOR THEIR ENTIRE RELATIONSHIP after a casual conversation between their respective sisters.

"Sister of the groom chatted with the sister of the bride. Just casual conversation but it came to light that almost 100% of what the bride had said besides her name was a complete lie," one person shared.

"Sister of the groom calls him up and says he really needs to figure out if this is right. A few fights and some long thinking later the groom leaves her and leaves town."

The drinkers:

"I was at a bachelor party the Tuesday night before a Saturday wedding," a bachelor party attendee recalled.

"After 8 hours or so of heavy drinking all day, we were at a baseball game and the groom punched a police officer in the back of the head and knocked him out for a few seconds. I watched it happen in slow motion, and thought to myself, "Welp, this wedding isn't going to be happening this weekend".

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"They did, they got caught, and the wedding was cancelled for obvious reasons," one man writes.

"As far as I know, the two are still serving time."

The ones that didn't happen during the bucks nor hens nights, but absolutely ruined relationships:

"A week before his wedding a friend of mine walked in on his dad having sex with his fiancée," one man writes.

"The next day in a fit of rage he trashed their room and in the process found explicit love letters between his recently married best friend (and best man) in her underwear drawer. The letters were as recent as the past week. The wedding was cancelled. Whenever I ran into him at a bar I made sure he never had to buy his own drinks."

At least he had one true friend, right? (Post continues after gallery.)

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A hotel employee shared a very similar but gender-flipped tale in which the groom was caught with the mother-of-the-bride:

"I heard a loud scream from upstairs. Cue the bride screaming and sobbing, shouting 'The wedding's off!!!' while storming out the place followed by the groom, stark bollock naked, covering his nether regions with his hands apologising profusely. Turns out she caught the mother of the bride and the groom shagging. Safe to say we had an easy shift the next day as we didn't have a wedding to cater for."

And finally, the ones that managed to turn it all around:

"My friend had been with his fiance of eight years when she got pregnant," one man writes.

"Fast forward eight months, and we decide that because they are basically common law married we need to throw him a bachelor party."

The story goes that the groom and his friends head into the big city, gets drunk and abused by strippers and his de facto partner immediately goes into labour, obviously.

A $300 cab ride to the hospital later he stumbles into the delivery room "smelling like strippers, with a dick drawn on his face and covered in glitter."

"I was positive that was the end... They've been married seven years and just had their second child last week."